<template>
  <div class="login_container">
    <div class="login_box">
        <!--头像区域-->
       <div class="avatar_box">
           <img src="../assets/logo.png" alt="">
       </div>
       <!--登录表单区域-->
       <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
           <!--用户名-->
            <el-form-item prop="username">
                <el-input v-model="loginForm.username" prefix-icon="el-icon-user"></el-input>
            </el-form-item>
            <!--密码-->
            <el-form-item prop="password">
                <el-input v-model="loginForm.password" prefix-icon="el-icon-lock" type="password"></el-input>
            </el-form-item>
            <!--按钮区域-->
            <el-form-item class="btns">
                <el-button type="primary" @click="login">登录</el-button>
                <el-button type="info" @click="resetLoginForm">重置</el-button>
            </el-form-item>
       </el-form>
    </div>
  </div>
</template>

<script>
export default {
    data(){
        return{
            //登录表单数据绑定对象
            loginForm: {
                username: 'admin',
                password: '123456'
            },
            //表单登录验证区域
            loginFormRules: {
                username: [
                    { required: true, message: '请输入昵称', trigger: 'blur' },
                    { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                ],
                password: [
                    { required: true, message: '请输入密码', trigger: 'blur' },
                    { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
                ]
            }
        }
    },
    methods: {
        //重置登录表单
        resetLoginForm(){
            this.$refs.loginFormRef.resetFields();
        },
        login(){
            this.$refs.loginFormRef.validate(async valid=>{
                if(!valid) return;
                const {data: res}= await this.$http.post('login', this.loginForm)
                if(res.meta.status !== 200 ) return this.$message.error('登录失败')
                this.$message.success('登录成功');
                //1.将登录成功的token保存到sessionStorage
                //1.1其他接口登录成功才能访问
                //1.2 token只在当前网站打开期间生效，所以将token保存在sessionstorage
                sessionStorage.setItem("token", res.data.token);
                //2.通过编程式导航跳转到后台主页，路由地址是 /home
                this.$router.push("/home");
            })
        }
    },
}
</script>

<style lang="less" scoped>
.login_container{
    background-color: #2b4b6b;
    height: 100%;
}

.login_box{
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
}

.avatar_box{
    height: 130px;
    width: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%,-50%);
    background-color: #fff;
    img{
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
    }
}

.login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}

.btns{
    display: flex;
    justify-content: flex-end;
}

</style>